By the end of the 1970s, the notion of green roofs concerned only intense roof gardens. Experience in the cultivation of these areas over the last 15 years has resulted in many discoveries and findings whose application has yielded great results in the design of green roofs of outstanding design.
The expansion of extensive roof gardens is the result of a significant change in attitudes over the past ten years. Ecological aspects of design have a growing impact. The demand for a lower price and the popularity of low-load roofs went in the direction of extensive green roofs of less thickness, specific composition, cheaper installation, and maintenance.
Fridrich Stowaser, nicknamed Hundertwasser (1927-2000), is one of the first architects to point out the importance of green roofs: green architecture could be one of the ways of this non-aggressive resistance. He perceived nature as a sublime reality, a source of universal harmony. His great respect for nature appeared in the desire to protect her from her greatest enemy – man.
Hundertwasser distinguished himself in his ecological commitment and felt that the appearance of each building should be conditioned by the aesthetic principles of his tenants. Hundertwasser’s house with a grassy roof in Vienna in 1985 is a physical manifestation of return to nature. Every free area on this house is filled with greenery, above all of the trees that Hundertwasser considered as equal occupants. The green roof is also related to his inventions of humus toilets and tenant trees.
One of the newer examples of a green roof building is the Green Citadel in Magdeburg, completed in October 2005, built according to the latest Hundertwasser project. In spite of the name, the complex is pink in color, and it consists of 55 apartments, hotels, and shops.
Why the Green roof is placed
Green roofs should become an integral part and regular phenomenon in the green area system of all regions. This type of roofs is worth the living space of insects and birds. The microclimate around the building is improving because the roof covered with greenery is less heated.
The large part of the rainwater is first retained on the roof and then gradually evaporated, unlike other roofs that immediately lead the water to the sewage system, and the evaporation of the remaining water is rapid (which in the short time creates a high degree of moisture saturation).
Also, the plant cover extends the lifetime of the roof insulation as it protects against large temperature fluctuations. However, the green roofs are a privilege of the population of countries with developed ecological awareness, as well as a culture of cultivating green areas.